A metal tank begins filling with water, and there is a constant rate of change of the weight of tank and water (in pounds) with respect to the volume of water in the tank (in gallons). Let w represent the weight of the tank and water together (in pounds). Let v represent the volume of water in the tank (in gallons). Untried When we say "there is a constant rate of change of the weight of tank and water (in pounds) with respect to the volume of water in the tank (in gallons)", it means which of the following? [Select all that apply.] w v = m for all corresponding values of w and v and for some constant number m w = m v for all corresponding values of w and v and for some constant number m w = m v for all corresponding values of w and v and for some constant number m w v = m for all corresponding values of w and v and for some constant m